Add Caylent reference in README.md (#1704)

Author: jeromevdl

README.md

@@ -230,6 +230,7 @@ Knowing which companies are using this library is important to help prioritize t
 The following companies, among others, use Powertools:
 
 * [Capital One](https://www.capitalone.com/)
+* [Caylent](https://caylent.com/)
 * [CPQi (Exadel Financial Services)](https://cpqi.com/)
 * [Europace AG](https://europace.de/)
 * [Vertex Pharmaceuticals](https://www.vrtx.com/)